What do unequal length headers do

This is usually around rpms, but those few RPM's can be vital for cars that require a quick spooling turbo. This is due in large part to the design of the headers, as a design is more efficient in these areas than a design seen with UEL Subaru Headers. The shorter runner on a UEL header will create a louder noise than a longer runner as it has less piping to travel through. This results in the iconic Subuaru Rumble. This rumble doesnt exist on cars running an Equal Length header.

Whether or not you want this sound will help you decide which header is best. Some people personally love the Boxer Rumble, while others are completely fine without it - it's all user preference!

Equal Length Headers appear to be the winner here. However, both headers will increase performance over stock, and both typically increase the sound of the exhaust. On most street driven applications, the increase in cylinder temperatures seen with a UEL Subaru header is negligible. Service Sectors a driving force in your business Providing precedenceing business services. Vijendra Parmar Hertz Inspection. Providing Data to AI companies.

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This comes also with a normalization of exhaust pressure backpressure at each exhaust port which improves engine volumetric efficiency and top-end power. Learn more about turbo Subaru ringland failure in the EJ For performance and reliability, the Equal Length manifold is a superior design. Sound is pressure, you're hearing the thousands of exhaust pulses being played like a musical instrument through the exhaust.

The iconic Boxer Rumble has nothing to do with the horizontal orientation of the engine and everything to do with the length of the exhaust runners. In fact, when you record a Subaru, the microphones wave form actually will show this! What you are looking at is the sound pressure recorded at the end of the exhaust for two similarly setup cars.

The top is my STI with the stock header. Both of our cars have 3 turbo backs and nearly identical setups otherwise. The bottom graph is smooth, equal, and ideal like a steady heartbeat. This is the difference in sound, its the sound of efficiency. We are constantly looking for new content ideas and feedback from the community.